We all go a little mad sometimes.

…unable to love anyone.

“I’m tired of living unable to love anyone. I don’t have a single friend – not one. And, worst of all, I can’t even love myself. Why is that? Why can’t I love myself? It’s because I can’t love anyone else. A person learns how to love himself through the simple acts of loving and being loved by someone else. Do you understand what I am saying? A person who is incapable of loving another cannot properly love himself.”
― Haruki Murakami, 1Q84